Hi, I hed sex around the time my period was due and then it was late, when I got it it looked normal but the pain was much worse then it usually is then a few days later it was brown/pinkish and it came and stopped every few hours...I was told to take a HPT and it was negative all three times...I am very tired, naseous every morning and lower abdominal cramps and this month my period is late again...could I be pregnant? please advise